The invention relates to a device for monitoring the state of a rotary bearing and diagnosing a fault based on a laboratory
virtual instrument engineering workbench (Lab VIEW). The device comprises an industrial
personal computer, a detection device, a stabilized-
voltage supply, a
data acquisition module, a
data processing module and a fault diagnosis module; the industrial
personal computer is provided with a programmable
communication interface (PCI)
data acquisition card including a simulated input channel; the detection device is provided with an acceleration
transducer and a
signal conditioning circuit; the
signal conditioning circuit is used for amplifying and filtering signals picked up by the acceleration
transducer and the like; the
data acquisition module is used for inputting acquired signals into the industrial
personal computer by a program, editing a data acquisition (DAQmx) driving program in the Lab VIEW, controlling sampling frequencies of the signals, inputting and outputting and the like; the
data processing module comprises denoising display, storage and characteristic extraction of the signals, and is used for removing the interference of
noise, extracting time-domain and frequency-domain characteristic quantity of the signals and preparing for fault diagnosis; the fault diagnosis module is used for obtaining fault information according to extracted characteristic data of the rotary bearing, outputting a diagnosis result and
processing suggestions. The device has the advantages of simple structure, high openness, good real-time performance, friendly human-computer interface, no need of diagnostician participation and higher reliability, and can be used for automatically identifying the fault of the rotary bearing.